Boy, you're a tough critic, Kelly. Only five successes in 40 years??? IMHO, Microsoft had far more successes than failures over the decades. Windows 3.1 was definitely a success - especially for those of us who'd used earlier versions of the product. Word and Excel were clearly individual successes longer before Office arrived. They handily toppled WordPerfect and Lotus 1-2-3 from their thrones. (Though, I still miss a few of WordPerfect's superior features.) Outlook and FrontPage were also winners, though FrontPage's heydays are long gone.
I'm also surprised that you didn't include RT on the failures list. Though I personally love using RT, it was quite a commercial flop.